DE4238853C2 - Condenser for an air conditioning system of a vehicle - Google Patents

Description

The invention relates to a condenser for an air conditioning system of a vehicle containing a tube-fin block, which is provided on both sides with manifolds, which by means of a separator walls are divided so that the tube-fin block egg NEN upper condensing section for refrigerant and an un teren subcooling section for refrigerant, being next one of the manifolds and a tubular one in parallel Collector is arranged, the Verbin with this manifold manure stands.

In a known condenser of the type mentioned at the outset (EP 0 480 330 A2, FIGS. 43 and 45), the collector arranged in parallel next to a collector pipe is connected to this collector pipe in such a way that the collector forms a kind of "dead" arm to the collector pipe . Excess refrigerant is branched off from the refrigerant flow between the condensing section and the sub-cooling section into the collector. In one embodiment, a gap is left in the region of the bottoms of the collecting tube for the production of the connection. In another embodiment, the lower region of a partition between the collecting pipe and the collector is perforated.

A capacitor is also known (US Pat. No. 5,159,821 A) which connect the collector pipe to its bottom via one of the U-shaped tube with the collection arranged parallel to it connected. The tube is in its upper, in Perforated area located so that from this Area where the liquid refrigerant escapes, which is then in the bottom area of the collector is suctioned off.  

In a further embodiment of the invention it is provided that the manifold and the parallel collector as a double tube are formed, in which the two tube chambers tren the connecting openings are made. So that he gives itself an extremely compact design that has no outside contains to be sealed connection or connection points.

In a first embodiment it is provided that the dop pel tube is assembled from at least two sheet metal profiles.

In another embodiment of the invention, it is preseeded hen that the double tube from sheet metal profiles and an extrusion ten connecting profile is composed. In both versions forms are first pre-assembled and then Ver solder the individual elements in an oven.

In a further embodiment of the invention, it is preseeded hen that the double pipe is an extruded two-chamber pipe.

In a further embodiment of the invention it is provided that the tube chamber serving as a collector is arranged offset with respect to the plane of the tube-fin block. This offset arrangement can lead to considerable installation advantages, in particular It is further known (JP Abstracts 4-121562 A) to provide a connection opening to a collector arranged in parallel in the lower region of a collecting tube. In the lower area of the collector there is an upwardly open sleeve. The sleeve forms an opening covered by a filter 34 , through which refrigerant flows into this sleeve. In this sleeve protrudes from above a suction line through which the refrigerant is sucked out of the sleeve in the collector Chen Chen.

The invention has for its object a capacitor of the type mentioned in such a way that relatively large constructive freedom in the training of the condensate sierabschnittes and in particular the sub-cooling section be standing, ensuring that the subcooling only liquid refrigerant flows in.

This object is achieved in that the collector one Flow connection between the condensing section and the Forms subcooling section and via a first connection opening voltage with the condensing section and via a second connection opening is connected to the sub-cooling section.

The training according to the invention on the one hand allows larger ones constructive freedoms while ensuring on the other hand is that within the collector there is a very good separation between gaseous and liquid refrigerant is obtained, using only liquid refrigerant to the supercooling section flows. At the same time, the collector forms an education equal chamber in which excess refrigerant between can be saved.  

when the condenser between a fan frame and a Radiator for the engine fluid of a vehicle in the engine compartment is arranged, in which usually only little space for Available.

Further features and advantages of the invention result from the following description of the shown in the drawing th embodiment.

Fig. 1 shows a vertical sectional view (along the line II of Fig. 2) through an inventive condensate sator,

Fig. 2 is a plan view of the capacitor of Fig. 1,

Fig. 3 is a plan view of a modified embodiment of a capacitor according to the invention with its built-in position with respect to a motor vehicle more excellent white elements,

FIGS. 4 and 5 embodiments for a modified-filament from Blechpro multiplexed composite double-tube which serves as a collecting tube and collector,

Fig. 6 and 7 are views from serve as a manifold and as a collector of the double pipes, HERGÉ as extruded pipes are assumed

FIGS. 8 and 9 are plan views of the manifold serving as a collector and as double pipes, the extension profile are each formed of a Verbin and attached thereto sheet profiles be available.

Fig. 10 is a partial vertical section through the lower loading area of a modified embodiment of a condenser with integrated collector, and

Fig. 11 shows a cross section through collecting tube and collector in the region of a connection opening.

The condenser shown in FIGS. 1 and 2 has a tube-fin block ( 10 ) with horizontally lying flat tubes ( 11 ) and fins ( 12 ) arranged between them. The flat tubes ( 11 ) open into manifolds ( 13 , 14 ) which run on both sides over the entire height of the tube-fin block ( 10 ). The manifold ( 13 ) on the left in the drawing is provided with an inlet connection ( 15 ) for gaseous refrigerant coming from a compressor. The same manifold ( 13 ) is also provided with a connection ( 16 ) for a line via which liquid refrigerant is transported to an expansion valve.

The two manifolds ( 13 , 14 ) are divided in the vertical direction by partitions ( 17 , 18 ) which divide the tube-fin block ( 10 ) into an upper condensing section for the condensing gaseous refrigerant and a sub-cooling section for the already liquid refrigerant. The two partitions ( 17 , 18 ) are at the same height. The manifolds ( 13 , 14 ) are divided in the condensing section above the partitions ( 17 , 18 ) by means of further intermediate partitions ( 19 , 20 ; 21 , 22 ) in such a way that the gaseous refrigerant describes a meandering path in the condensing section, where in the flow cross-section with increasing cooling accordingly the decreasing volume of the gaseous refrigerant is also reduced.

At one of the collecting pipes (in the drawing to the right Sam melrohr 14 ), a collector ( 23 ) is connected, which is connected via a connection opening ( 24 ) to the lower outlet region of the condensing section. Liquid refrigerant collects up to a certain level in the collector ( 23 ). There is gaseous refrigerant above it. The collector ( 23 ) causes through its function as a steam separator and filling quantity reservoir that the state of the refrigerant emerging from the connection opening ( 24 ) in the collector ( 23 ) is substantially saturated, ie the refrigerant is already fully condensed there.

The collector ( 23 ) is connected via a connection opening ( 25 ), which is located particularly in the area of the floor, to the sub-cooling section, in which liquid refrigerant is subcooled. The manifolds ( 13 , 14 ) are in the subcooling section each by an intermediate partition ( 26 , 27 ), so that there is a Z-shaped flow path for the liquid refrigerant from the connection opening ( 25 ) to the outlet outlet ( 16 ) results.

The headers ( 13 , 14 ) are closed at the top and bottom by end walls ( 28 , 29 , 30 , 31 ). The Abschlußwän de ( 30 , 31 ) of the manifold ( 14 ) also simultaneously the upper and lower end walls for the on the manifold ( 14 ) set tubular collector ( 23 ).

As shown in Fig. 1, a dryer cartridge ( 32 ) is arranged within the collector ( 23 ). In the Ausführungsbei game of FIG. 1, the dryer cartridge (32) is not removable from the collector (23). In a modified embodiment, it is provided that the closure wall ( 31 ), ie the Bo the collector ( 23 ), is provided with a threaded connector into which a diameter of the dryer cartridge ( 32 ) corre sponding lid is screwed tight. In this embodiment, the dryer ( 32 ) can then be removed and exchanged from the collector.

In the exemplary embodiment according to FIGS. 1 and 2, the collecting tube on the left in the drawing consists of two sheet metal profiles ( 33 , 34 ) of approximately semi-oval cross section, the edges of which overlap.

Also in the drawing right manifold ( 14 ) is composed of two sheet metal profiles ( 35 , 36 ) which overlap each other pen. The sheet profile ( 35 ) is provided with extended edges ( 37 ) which form connection surfaces for the collector ( 23 ), which consists of a substantially cylindrically curved sheet profile.

The entire capacitor is constructed so that it is in the previous described form can be pre-assembled, the individual Already hold the elements together in a non-positive or positive manner. In this assembled or pre-assembled shape is the Capacitor placed in a soldering oven, in which soldering and thus a firm and tight connection between the individual elements. The individual elements are in known manner provided with a solder plating.

In motor vehicles, it is common that a capacitor, as shown in Fig. 3, is arranged in the direction of travel in front of a cooler ( 40 ) for the engine coolant. A fan with a fan frame ( 41 ) is then located in front of the condenser. In the embodiment according to FIG. 3, the collector ( 23 ') is attached to the collecting tube ( 14 ') in such a way that it is offset with respect to the plane of the tube-fin block ( 10 ). This makes it possible to attach the tubular collector ( 23 ') to the collecting tube ( 14 ') without the previous installation dimensions having to be changed. It is of course also possible to arrange the collector ( 23 ') rotated further clockwise relative to the collector pipe ( 14 '), so that the tube-fin block ( 10 ) with the collector pipe ( 14 ) moves even closer to the cooler ( 40 ) can be. In addition, it is possible to provide the collector ( 23 ') with a contour which at a distance surrounds the indicated water tank ( 42 ) of the cooler.

In the embodiment according to FIG. 4 it is provided that the collecting tube ( 14 ") with the integrally formed collector ( 23 ") is composed of three sheet metal profiles similar to FIG. 1. In this water embodiment, however, the sheet metal profile forming the collector ( 23 ") is provided with bent tabs which lie on the outside of the collecting tube ( 14 ") and are soldered to the sealing tube there.

In the embodiment according to FIG. 5 it is provided that the header pipe ( 14 ''') and the collector ( 23 ''') are only formed from two sheet metal profiles ( 35 and 43 ). The sheet profile ( 35 ) speaks in its shape to the sheet profile used in FIGS. 1 and 2 ( 35 ). The sheet metal profile forming the collector ( 23 ''') is a closed tube ( 43 ) which has a flattened portion in the region facing the collector tube ( 14 '''). Of course, it is also possible to use a completely cylindrical tube or a rectangular or square or other shaped tube.

In the embodiment according to FIG. 6, an extruded double tube ( 44 ) is provided, which forms a collector tube with a tube chamber and the collector with another tube chamber.

As shown in Fig. 7, a double tube ( 45 ) can be vorgese hen, which has an asymmetrical profile, provided that this is advantageous for reasons of installation.

In the embodiment according to FIG. 8, an extruded intermediate profile ( 46 ) is provided, which is provided with receiving slots ( 47 , 48 ) running in the vertical direction, into which the edges of approximately semi-oval sheet metal profiles ( 49 , 50 ) are inserted Form the collecting tube and a collector.

The same principle according to FIG. 8 is also provided in the embodiment according to FIG. 9, ie by means of an extruded connecting profile ( 51 ) two sheet metal profiles ( 52 , 53 ) are joined together, which form a collecting pipe and a collector. The connecting profile ( 51 ) is provided with receiving slots ( 54 , 55 ) in the vertical direction, into which the edges of the sheet profiles ( 52 , 53 ) are inserted.

As already mentioned, the spaced-apart connecting openings ( 24 , 25 ) between the header ( 14 ) and the collector ( 23 ) ensure that the collector is flowed through by the cooling medium. In order to ensure that the lower cooling section receives liquid coolant from the connection opening ( 25 ) as far as possible, the collector ( 23 ) must also perform the function of a liquid separator in an ideal manner. The effect of the collector ( 23 ) is then that, depending on the operating state, a different liquid level is formed in the collector ( 23 ), which influences the condensation pressure and thus the associated condensation temperature so that the state of the through the connection opening ( 24 ) refrigerant flowing into the collector ( 23 ) in all operating states is also largely saturated with liquid. The slim design of the collector ( 23 ) can lead to gas bubbles being entrained downward as a result of the high flow velocity of the refrigerant mass flow in the collector ( 23 ) from the connection opening ( 24 ) to the connection opening ( 25 ), as a result of which the desired, the best possible phase separation and thus the separation of the capacitor module in the condensation section and subcooling section would be impaired. To prevent this, it is provided according to the embodiment of FIGS. 10 and 11 that the connecting opening ( 24 ) is designed so that it generates a liquid vortex, whereby the heavier liquid components of the refrigerant mass flow outward and then at the The inner wall flows downwards, while the lighter gas components remain in the center and migrate upwards. For this purpose, the connection opening ( 24 ) is designed as a punched opening, from which a tab ( 56 ) serving as a guide means is folded out. The tab ( 56 ) is directed towards the subsequent inner wall of the collector ( 23 ), so that the refrigerant flows into the collector with a vortex. In the illustrated embodiment, the collector ( 23 ) has a substantially cylindrical cross-section, the tab ( 56 ) being approximately tangentially aligned.

As shown in Fig. 10, it is possible to form the lower connection port ( 25 ) through which refrigerant flows from the header ( 23 ) to the sub-cooling section in a corresponding manner. Appropriately, it is provided here that the tab ( 57 ) is folded out in opposite directions, so that the liquid refrigerant flows out with a flow in the same direction.

As further shown in Fig. 10, the collecting pipe ( 14 ) and the adjoining collector ( 23 ) are closed by means of a common cover ( 58 ), the slots with the contours of Sam melrohr ( 14 ) and collector ( 23 ) is provided so that this cover ( 58 ) is plugged onto the ends of the collecting pipe ( 14 ) and collector ( 23 ) and is soldered to them. In the area of the collector ( 23 ), the cover ( 58 ) is provided with a threaded bore into which a sealing plug ( 59 ) is screwed. A sealing ring ( 60 ), in particular an O-ring, is inserted between the sealing plug ( 59 ) and the cover ( 58 ). The dryer ( 32 ) consists of granules filled into a small bag. This dryer can be replaced after loosening the sealing plug ( 59 ). Fortunately, the dryer ( 32 ) is kept so short in the axial direction that it does not reach into the area of the connection opening ( 24 ), so that there the vortex formation in the collector ( 23 ) is not prevented by the dryer ( 32 ).

Claims (9)

1. Condenser for an air conditioning system of a vehicle, which contains a tube-fin block, which is provided on both sides with manifolds which are divided by means of partitions such that the tube-fin block section has an upper condensing section for refrigerant and a lower sub-cooling section for refrigerant forms, in addition to one of the collecting tubes and parallel to it a tubular collector is arranged which is connected to this collecting tube, characterized in that the collector ( 23 ) forms a flow connection between the condensing section and the subcooling section and via a first connection opening ( 24 ) with the condenser section and is connected to the subcooling section via a second connection opening ( 25 ). 2. Condenser according to claim 1, characterized in that the collecting tube ( 14 ) and the parallel collector ( 23 ) are designed as a double tube, in the separating wall of the connecting openings ( 24 , 25 ) are made. 3. Condenser according to claim 2, characterized in that the double tube is composed of at least two sheet metal profiles ( 35 , 36 , 38 ; 35 , 43 ). 4. Condenser according to claim 2, characterized in that the double tube is composed of sheet metal profiles ( 49 , 50 ; 52 , 53 ) and an extruded connecting profile ( 46 ; 51 ). 5. Condenser according to claim 2, characterized in that the double tube is an extruded two-chamber tube ( 44 , 45 ). 6. Condenser according to one of claims 1 to 5, characterized in that a dryer ( 32 ) is arranged in the collector ( 23 ). 7. Condenser according to one of claims 1 to 6, characterized in that the tubular collector ( 23 ') is offset from the plane of the tube-fin block ( 10 ) is arranged. 8. Condenser according to one of claims 1 to 7, characterized in that at least the first connection opening ( 24 ), which leads from the condenser section to the collector ( 23 ), has an outlet with a vortex generating shape in the collector ( 23 ) having. 9. A capacitor according to claim 8, characterized in that the outlet of the connecting opening ( 24 ) with a Füh approximately element ( 56 ) is provided, which is directed towards a connecting opening to the connec tion wall of the collector ( 23 ).